Interestingly, I found this through Steam; I guess the Valve team is really
impressed by it. Steam's "Update News" has a link to youtube about it,
along with the following intro text...
"The short film Escape from City 17: Part One, viewable on YouTube via the
link below, was inspired by the Half-Life 2 episodes and chronicles the
escape from City 17 by some members of the citizens resistance. It was
created by The Purchase Brothers, a commercial directing duo, and their
small team based in Toronto, Canada. They have been Half-Life enthusiasts
from the start and have created this short, the first in a series, on a
shoestring budget using handmade costumes, some donated equipment, and the
Source SDK, not to mention lots of their own *** , sweat and (we assume)
tears. It was sent to Valve unannounced, and we were blown away -- the
production quality certainly exceeds that of the usual community-made movies
we see. We're told the second episode is nearing completion, and we can't
wait to see what's in store. We hope that you enjoy the series."